2,2&#39;,6,6&#39;-tetraisopropyl-4,4&#39;-biphenol lipid microsphere preparations and preparation methods therefor

ABSTRACT

This invention relates to a 2,2′,6,6′-tetraisopropyl-4,4′-biphenol lipid microsphere preparation having 2,2′,6,6′-tetraisopropyl-4,4′-biphenol as its active ingredient and formed into said lipid microsphere preparation with common medically used injection-grade oil, emulsifier, and injection-grade water.

FIELD OF THE INVENTION

This invention relates to 2,2′,6,6′-tetraisopropyl-4,4′-biphenol lipidmicrosphere preparations and the preparation methods therefor, in thefield of pharmaceutical preparations.

BACKGROUND OF THE INVENTION

2,2′,6,6′-tetraisopropyl-4,4′-biphenol (hereinafter referred to asbiphenol) is an anti-epileptic compound newly developed (Chinese patentCN 101804043A, Uses of biphenol and its derivatives in drugs for thetreatment of epilepsy) for treating many epileptic symptoms such asgeneralized tonic-clonic seizures (grand mal), absence seizures (petitmal), simple partial seizures, complex partial seizures (psychomotorseizures), autonomic seizures (periodic seizures) and others.Experimental studies have shown that biphenol has a strong affinitytowards GABA receptors and is a GABA agonist, while it is an antagonistfor NMDA receptors for regulating the Ca²⁺ influx in Ca²⁺ channels.Biphenol also offers protection against the excitotoxic effect inducedby kainate (kainic acid). Studies have confirmed that biphenol is asignificantly stronger antioxidant than propofol and has a strongerprotective effect on the brain. Of particular importance is thatbiphenol does not cause the patients to lose consciousness and thereforehas important clinical values in the treatment of patients withdifferent types of epilepsy.

However, biphenol is a highly lipid soluble compound that is difficultto dissolve in water. Studies have shown that it is difficult to achievea desired effect by using surfactants such as cyclodextrin, Tween 80,V_(c) or DMSO to assist or increase its dissolution and, thereby, itsefficacy is affected and its clinical application becomes limited. Inthis invention, lipid microspheres are used as a drug carrier for thebiphenol. This not only overcomes the problems due to insolubility ofbiphenol, but also allows the drug to be selectively accumulated in alesion site and maximizes the amount of drug that is delivered to atargeted site so that the concentration of the drug at that site can beincreased by several to hundred times above that of conventionalpreparations to improve its therapeutic effect. At the same time, thereis minimal amount of drugs distributed in healthy tissues such that anycytotoxic side effects and adverse reactions are significantly reduced,and hence high efficacy with low toxicity would be achieved. Currently,there has been no report on biphenol lipid microsphere preparations.Therefore, the rational formulation of a preparation based on thephysiochemical properties of biphenol for safe, stable and effectivebiphenol lipid microspheres is an issue this invention will address.

The present invention provides a 2,2′,6,6′-tetraisopropyl-4,4′-biphenollipid microsphere preparation and its preparation method. 0.5˜1% ofantioxidants were added to the preparation to address the issue thatbiphenol is easily oxidizable. Particularly, vitamin E, a potent, lipidsoluble antioxidant, is used for ensuring the stability of the drug inthe preparation. This invention uses only phospholipid emulsifiers in anamount of 1 to 1.5% without any co-solvent so as to prevent hemolysisand production of substances that may otherwise cause thromboticinflammation. Further, the emulsifiers of this invention are egglecithin derived from the yolk of animal embryos which are easier andsafer to be absorbed by the human body.

SUMMARY OF THE INVENTION

The present invention provides a 2,2′,6,6′-tetraisopropyl-4,4′-biphenollipid microsphere preparation, and preparation method therefor.

The lipid microsphere preparations of this invention are prepared by theprocessing of active ingredients comprising2,2′,6,6′-tetraisopropyl-4,4′-biphenol (hereinafter referred asbiphenol), injection-grade oil, emulsifier, and injection-grade water.In a specific embodiment, 0.1˜3% of biphenol, 10˜30% of injection-gradeoil, 1˜1.5% of emulsifiers, 0.5˜1% of antioxidants, 0˜5% of additiveswith the remaining being injection-grade water. All units are inpercentage by weight.

The chemical structure of said biphenol is:

The injection-grade oil is selected from one or more of soybean oil,medium chain triglyceride oil, sea buckthorn oil, and tea oil.

The emulsifier is selected from one or more of soy lecithin,hydrogenated lecithin, synthetic lecithin, and egg lecithin.

The antioxidant is selected from one or more of vitamin E, ascorbicacid, and sodium hydrogen sulfite.

The additive is selected from one or more of pH adjusting agent,tonicity adjusting agents, complexing agents; said pH adjusting agent ishydrochloric acid or sodium hydroxide; said tonicity adjusting agent isglycerin; said complexing agent is EDTA; wherein their percentage byweight in an injection preparation are 0.01 to 1%, 0.1˜2.5% and 0.01 to1% respective.

Preferably, the lipid microsphere preparation of this invention has thefollowing composition.

Every 100 ml of lipid microsphere preparation comprises 1000 mg ofbiphenol, 10 g of soybean oil, 1.2 g of injection-grade egg lecithin forinjection, 1 g of vitamin E, 2.5 g of glycerin, 0.5 g EDTA, and theremaining being injection-grade water.

Other preferred embodiments for the lipid microsphere preparation ofthis invention are disclosed in the Examples.

This invention also aims to provide a method for preparing biphenollipid microsphere preparations.

The preparation method of this invention comprises the following steps:

-   1) Dissolving the emulsifiers completely with the injection-grade    oil under a nitrogen atmosphere and in a 70° C. water bath; adding    the antioxidants with stirring for dissolution before adding the    biphenol with heat and stirring for dissolution to obtain an oil    phase;-   2) Dissolving the tonicity adjusting agents and the complexing    agents in the injection-grade water to obtain an aqueous phase;-   3) Adding the oil phase slowly to the aqueous phase while shearing    under nitrogen for 5 minutes to obtain a preliminary emulsion;-   4) Homogenizing the preliminary emulsion with a high-pressure    homogenizer before filtering with a microporous membrane filter,    flushing with nitrogen, sealing and autoclaving at 115° C. to form    the final product.

In the present invention, due to differences in water-solubility ofantioxidants, there are different ways for adding the antioxidants.Lipid-soluble antioxidants are added to the oil phase whilewater-soluble antioxidants are added to the aqueous phase.

In a specific embodiment, said method for preparing biphenol lipidmicrosphere preparations comprises the following steps:

-   1) Weighing the raw materials: 1 g˜30 g of biphenol, 100 ml˜300 ml    injection-grade oil, 25 g of glycerin, 10 g˜15 g of emulsifiers, 5    g˜10 g of antioxidants, with the remaining being injection-grade    water.-   2) Dissolving the emulsifiers and the antioxidants (Vitamin E)    completely with the injection-grade oil under a nitrogen atmosphere    and in a 70° C. water bath, before adding the biphenol with heat and    stirring for dissolution to obtain an oil phase;-   3) Dissolving the glycerin and the complexing agents in the    injection-grade water and stir to obtain an aqueous phase;-   4) Adding the oil phase slowly to the aqueous phase while shearing    under nitrogen (10000 r, 5 min) to obtain a preliminary emulsion,    and adjusting the pH to around 8.0 with NaOH;-   5) Homogenizing the preliminary emulsion 5˜8 times with a    high-pressure homogenizer at 800˜900 bar before filtering with a    microporous membrane filter, flushing with nitrogen, sealing and    autoclaving at 115° C. to obtain the final product (1000 ml).

In another specific embodiment, said method for preparing biphenol lipidmicrosphere preparations comprises the following steps:

-   1) Weighing the raw materials: 1 g˜30 g biphenol, 100 ml˜300 ml    injection-grade oil, 25 g of glycerin, 10 g˜15 g of emulsifiers, 5    g˜10 g of antioxidants, with the remaining made up of    injection-grade water.-   2) Dissolving the emulsifier completely in the injection-grade oil    under a nitrogen atmosphere and in a 70° C. water bath before adding    the biphenol with heat and stirring for dissolution to obtain an oil    phase;-   3) Dissolving the glycerin, the antioxidants (ascorbic acid or    sodium bisulfite) and the complexing agents in injection-grade water    and stirring to obtain an aqueous phase;-   4) Adding the oil phase slowly to the aqueous phase while shearing    under nitrogen (10000 r, 5 min) to obtain a preliminary emulsion,    and adjusting pH to around 8.0 with NaOH;-   5) Homogenizing the preliminary emulsion 5˜8 times with a    high-pressure homogenizer at 800˜900 bar before filtering with a    microporous membrane filter, flushing with nitrogen, sealing and    autoclaving at 115° C. to obtain the final product (1000 ml).

Other embodiments of the preparation method of this invention aredisclosed in the Examples.

The preparation of this invention is a lipid microsphere preparation foruse in intravenous injections.

The particle size of the lipid microspheres of this invention is in therange of 100 nm˜800 nm with the average particle size being 150 nm˜300nm.

In the preparation of this invention, biphenol is encapsulated withinlipid microspheres which greatly increase its solubility in water, theamount of drug that can be loaded, and also the stability of thepreparation. Further, being a novel drug carrier, lipid microspheres arenon-toxic, non-immunogenic, reducing irritation due to the drug anddecreasing the drug's toxic side effects.

This invention increases the stability of the injection, extends thedrug's shelf life, improves its solubility and ensures its safeness.Moreover, the simple and feasible preparation process of the presentinvention is time and cost effective such that it is well suited formass production. Furthermore, the formula and preparation methods forthe preparation of this invention have been scientifically screened andproven.

The preparation of this invention relates to anti-epilepticpreparations.

The anti-epileptic preparation of this invention has significantlyhigher efficacy in comparison to CMCNa-biphenol.

In this invention, the method for administering the drug is switchedfrom oral administration to intravenous injection which improves drugabsorption and increases the therapeutic effect of the drug;

Detailed experimental results on the anti-epileptic effect of thepreparation of this invention can be found in the Examples.

Obviously, further embodiments can be devised by means of modification,replacement or alteration of the invention described above with commonknowledge and skills in the art without steering away from the basicconcepts of this invention.

The following specific embodiments in the Examples aim to providefurther explanation of the above description. One should not interpretthis as a means to limit the scope of this invention to only theembodiments which follow. All embodiments based on the above descriptionshould fall into the scope of this invention.

DETAILED DESCRIPTION OF THE INVENTION

The following examples further illustrate the present invention but inno way limit the scope of the present invention. Those skilled in theart will appreciate that the present invention is not limited to theembodiments and methods of preparation described with reference to thefollowing examples. Further, those equivalent embodiments that skilledperson in the art can make by modification, replacement or alteration ofthe present invention should also fall into the scope of the presentinvention.

Part 1) Lipid Microsphere Preparation Prepared with DifferentConcentrations of Biphenol Example 1 1% Biphenol Lipid MicrospherePreparation

Drugs and Excipients Amount (g) Biphenol 10.0 Soybean oil(Injection-grade) 100 Egg lecithin 12 Vitamin E 10 Glycerin 25 EDTA 5Injection-grade water Make up to 1000 ml

Preparation Method

1) 12 g of egg lecithin was completely dissolved in 100 g ofinjection-grade oil under a nitrogen atmosphere and in a 70° C. waterbath. 10 g of biphenol and 10 g of vitamin E were then added andnitrogen gas was fed in for protection before being dissolved, with heatand stirring, to obtain an oil phase.

2) 20 g of glycerin and 5 g of EDTA were dissolved, with stirring, inthe injection-grade water to obtained an aqueous phase.

3) The oil phase was added slowly to the aqueous phase while shearedunder nitrogen (10000 r, 5 min) to obtain a preliminary emulsion whichwas then adjusted to around pH 8.0 with sodium hydroxide.

4) The preliminary emulsion was homogenized with a high-pressurehomogenizer and filtered with a microporous membrane filter before beingflushed with nitrogen, sealed, autoclaved at 115° C. to obtain the finalproduct.

Example 2 0.1% Biphenol Lipid Microsphere Preparation

Drugs and Excipients Amount (g) Biphenol 1.0 Sea buckthorn oil(Injection- 100 grade) Hydrogenated Lecithin 12 Ascorbic acid 10Glycerin 25 EDTA 5 Injection-grade water Make up to 1000 ml

Preparation Method

1) 12 g of hydrogenated lecithin was completely dissolved in 100 g ofinjection-grade oil under a nitrogen atmosphere and in a 70° C. waterbath. 1 g of biphenol was then added and nitrogen gas was fed in forprotection before being dissolved, with heat and stirring, to obtain anoil phase.

2) 25 g of glycerin, 10 g ascorbic acid and 5 g of EDTA were dissolved,with stirring, in the injection-grade water to obtain the aqueous phase.

3) The oil phase was added slowly to the aqueous phase while shearedunder nitrogen (10000 r, 5 min) to obtain a preliminary emulsion whichwas then adjusted to around pH 8.0 with sodium hydroxide.

4) The preliminary emulsion was homogenized with a high-pressurehomogenizer and filtered with a microporous membrane filter before beingflushed with nitrogen, sealed, autoclaved at 115° C. to obtain the finalproduct.

Example 3 3% Biphenol Lipid Microsphere Preparation

Drugs and Excipients Amount (g) Biphenol 30 Injection-grade Medium-chain100 triglyceride oil Soy lecithin 12 Sodium bisulfite 10 Glycerin 25EDTA 5 Injection-grade water Make up to 1000 ml

Preparation Method

1) 12 g of soy lecithin was completely dissolved in 100 g ofinjection-grade oil under a nitrogen atmosphere and in a 70° C. waterbath. 30 g of biphenol was then added and nitrogen gas was fed in forprotection before being dissolved, with heat and stirring, to obtain anoil phase.

2) 25 g of glycerin, 10 g of sodium bisulfite and 5 g of EDTA weredissolved, with stirring, in the injection-grade water to obtained anaqueous phase.

3) The oil phase was added slowly to the aqueous phase while shearedunder nitrogen (10000 r, 5 min) to obtain a preliminary emulsion whichwas then adjusted to around pH 8.0 with sodium hydroxide.

4) The preliminary emulsion was homogenized with a high-pressurehomogenizer and filtered with a microporous membrane filter before beingflushed with nitrogen, sealed, autoclaved at 115° C. to obtain the finalproduct.

Part 2) Lipid Microsphere Preparation Prepared with Different Types ofInjection Oil and Contents Example 4 Lipid Microsphere Preparation with20% Soybean Oil

Drugs and Excipients The amount (g) Biphenol 10.0 Injection-gradeSoybean oil 200 (Injection-grade) Egg lecithin 12 Vitamin E 10 Glycerin25 EDTA 5 Injection-grade water Make up to 1000 ml

Preparation Method

1) 12 g of egg lecithin was completely dissolved in 200 g ofinjection-grade oil under a nitrogen atmosphere and in a 70° C. waterbath. 10 g of biphenol and 10 g of vitamin E were then added andnitrogen gas was fed in for protection before being dissolved, with heatand stirring, to obtain an oil phase.

2) 25 g of glycerin and 5 g of EDTA were dissolved, with stirring, inthe injection-grade water to obtain the aqueous phase.

3) The oil phase was added slowly to the aqueous phase while shearedunder nitrogen (10000 r, 5 min) to obtain a preliminary emulsion whichwas then adjusted to around pH 8.0 with sodium hydroxide.

4) The preliminary emulsion was homogenized with a high-pressurehomogenizer for 5˜8 times at 800˜900 bar and filtered with a microporousmembrane filter before being flushed with nitrogen, sealed, autoclavedat 115° C. to obtain the final product.

Example 5 Lipid Microsphere Preparation with 10% Medium-Chain GlycerideOil

Drugs and their accessories The amount (g) Biphenol 10.0 Injection-gradeMedium chain 100 triglyceride oil (Injection- grade) Egg lecithin 12Vitamin E 10 Glycerin 25 EDTA 5 Injection-grade water Make up to 1000 ml

Preparation Method

1) 12 g of egg lecithin was completely dissolved in 200 g ofinjection-grade oil under a nitrogen atmosphere and in a 70° C. waterbath. 10 g of biphenol and 10 g of vitamin E were then added andnitrogen gas was fed in for protection before being dissolved, with heatand stirring, to obtain an oil phase.

2) 25 g of glycerin and 5 g of EDTA were dissolved, with stirring, inthe injection-grade water to obtain an aqueous phase.

3) The oil phase was added slowly to the aqueous phase while shearedunder nitrogen (10000 r, 5 min) to obtain a preliminary emulsion whichwas then adjusted to around pH 8.0 with sodium hydroxide.

4) The preliminary emulsion was homogenized with a high-pressurehomogenizer for 5˜8 times at 800˜900 bar and filtered with a microporousmembrane filter before being flushed with nitrogen, sealed, autoclavedat 115° C. to obtain the final product.

Example 6 Lipid Microsphere Preparation with 30% Sea Buckthorn Oil

Drugs and Excipients Amount (g) Biphenol 10.0 Injection-grade Seabuckthorn 300 oil Egg lecithin 12 Vitamin E 10 Glycerin 25 EDTA 5Injection-grade water Make up to 1000 ml

Preparation Method

1) 12 g of egg lecithin was completely dissolved in 200 g ofinjection-grade oil under a nitrogen atmosphere and in a 70° C. waterbath. 10 g of biphenol and 10 g of vitamin E were the added and nitrogengas was fed in for protection before being dissolved, with heat andstirring, to obtain an oil phase.

2) 25 g of glycerin and 5 g of EDTA were dissolved, with stirring, inthe injection-grade water to obtain an aqueous phase.

3) The oil phase was added slowly to the aqueous phase while shearedunder nitrogen (10000 r, 5 min) to obtain a preliminary emulsion whichwas then adjusted to around pH 8.0 with sodium hydroxide.

4) The preliminary emulsion was homogenized with a high-pressurehomogenizer for 5˜8 times at 800˜900 bar and filtered with a microporousmembrane filter before being flushed with nitrogen, sealed, autoclavedat 115° C. to obtain the final product.

Example 7 Lipid Microsphere Preparation with 10% Tea Oil

Drugs and Excipients Amount (g) Biphenol 10.0 Injection-grade Tea oil100 Egg lecithin 12 Vitamin E 10 Glycerin 25 EDTA 5 Injection-gradewater Make up to 1000 ml

Preparation Method

1) 12 g of egg lecithin was completely dissolved in 200 g ofinjection-grade oil under a nitrogen atmosphere and in a 70° C. waterbath. 10 g of biphenol and 10 g of vitamin E were then added andnitrogen gas was fed in for protection before being dissolved, with heatand stirring, to obtain an oil phase.

2) 25 g of glycerin and 5 g of EDTA were dissolved, with stirring, inthe injection-grade water to obtain an aqueous phase.

3) The oil phase was added slowly to the aqueous phase while shearedunder nitrogen (10000 r, 5 min) to obtain a preliminary emulsion whichwas then adjusted to around pH 8.0 with sodium hydroxide.

4) The preliminary emulsion was homogenized with a high-pressurehomogenizer for 5˜8 times at 800˜900 bar and filtered with a microporousmembrane filter before being flushed with nitrogen, sealed, autoclavedat 115° C. to obtain the final product.

Part 3) Lipid Microsphere Preparations with Different Type and Amount ofEmulsifier Example 8 Lipid Microsphere Preparation with 30% SeaBuckthorn Oil

Drugs and Excipients Amount (g) Biphenol 10.0 Injection-grade Soybeanoil 100 Egg lecithin 10 Vitamin E 10 Glycerin 25 EDTA 5 Injection-gradewater Make up to 1000 ml

Preparation Method

1) 10 g of egg lecithin was completely dissolved in 100 g ofinjection-grade oil under a nitrogen atmosphere and in a 70° C. waterbath. 10 g of biphenol and 10 g of vitamin E were then added andnitrogen gas was fed in for protection before being dissolved, with heatand stirring, to obtain an oil phase.

2) 25 g of glycerin and 5 g of EDTA were dissolved, with stirring, inthe injection-grade water to obtain an aqueous phase.

3) The oil phase was added slowly to the aqueous phase while shearedunder nitrogen (10000 r, 5 min) to obtain a preliminary emulsion whichwas then adjusted to around pH 8.0 with sodium hydroxide.

4) The preliminary emulsion was homogenized with a high-pressurehomogenizer for 5˜8 times at 800˜900 bar and filtered with a microporousmembrane filter before being flushed with nitrogen, sealed, autoclavedat 115° C. to obtain the final product.

Example 9 Lipid Microsphere Preparation with 1.5% Soy Lecithin

Drugs and Excipients Amount (g) Biphenol 10.0 Injection-grade Soybeanoil 300 Soy lecithin 15 Vitamin E 10 Glycerin 25 EDTA 5 Injection-gradewater Make up to 1000 ml

Preparation Method

1) 15 g of egg lecithin was completely dissolved in 100 g ofinjection-grade oil under a nitrogen atmosphere and in a 70° C. waterbath. 10 g of biphenol and 10 g of vitamin E were then added andnitrogen gas was fed in for protection before being dissolved, with heatand stirring, to obtain an oil phase.

2) 25 g of glycerin and 5 g of EDTA were dissolved, with stirring, inthe injection-grade water to obtain an aqueous phase.

3) The oil phase was added slowly to the aqueous phase while shearedunder nitrogen (10000 r, 5 min) to obtain a preliminary emulsion whichwas then adjusted to around pH 8.0 with sodium hydroxide.

4) The preliminary emulsion was homogenized with a high-pressurehomogenizer for 5˜8 times at 800˜900 bar and filtered with a microporousmembrane filter before being flushed with nitrogen, sealed, autoclavedat 115° C. to obtain the final product.

Example 10 Lipid Microsphere Preparation with 1.2% Hydrogenated Lecithin

Drugs and Excipients Amount (g) Biphenol 10.0 Injection-grade Soybeanoil 100 Hydrogenated Lecithin 12 Vitamin E 10 Glycerin 25 EDTA 5Injection-grade water Make up to 1000 ml

Preparation Method

1) 12 g of hydrogenated lecithin was completely dissolved in 100 g ofinjection-grade oil under a nitrogen atmosphere and in a 70° C. waterbath. 10 g of biphenol and 10 g of vitamin E were then added andnitrogen gas was fed in for protection before being dissolved, with heatand stirring, to obtain an oil phase.

2) 25 g of glycerin and 5 g of EDTA were dissolved, with stirring, inthe injection-grade water to obtain an aqueous phase.

3) The oil phase was added slowly to the aqueous phase while shearedunder nitrogen (10000 r, 5 min) to obtain a preliminary emulsion whichwas then adjusted to around pH 8.0 with sodium hydroxide.

4) The preliminary emulsion was homogenized with a high-pressurehomogenizer for 5˜8 times at 800˜900 bar and filtered with a microporousmembrane filter before being flushed with nitrogen, sealed, autoclavedat 115° C. to obtain the final product.

Example 11 Lipid Microsphere Preparation with 1.2% SyntheticPhospholipid

Drugs and Excipients Amount (g) Biphenol 10.0 Injection-grade Soybeanoil 100 Synthetic phospholipids 12 Vitamin E 10 Glycerin 25 EDTA 5Injection-grade water Make up to 1000 ml

Preparation Method

1) 12 g of synthetic phopholipid was completely dissolved in 100 g ofinjection-grade oil under a nitrogen atmosphere and in a 70° C. waterbath. 10 g of biphenol and 10 g of vitamin E were then added andnitrogen gas was fed in for protection before being dissolved, with heatand stirring, to obtain an oil phase.

2) 25 g of glycerin and 5 g of EDTA were dissolved, with stirring, inthe injection-grade water to obtain an aqueous phase.

3) The oil phase was added slowly to the aqueous phase while shearedunder nitrogen (10000 r, 5 min) to obtain a preliminary emulsion whichwas then adjusted to around pH 8.0 with sodium hydroxide.

4) The preliminary emulsion was homogenized with a high-pressurehomogenizer for 5˜8 times at 800˜900 bar and filtered with a microporousmembrane filter before being flushed with nitrogen, sealed, autoclavedat 115° C. to obtain the final product.

Part 4) Lipid Microsphere Preparation with Different Types and Amount ofAntioxidant Example 12 Lipid Microsphere Preparation with 0.5% Vitamin E

Drugs and Excipients Amount (g) Biphenol 10.0 Injection-grade Soybeanoil 100 Egg lecithin 12 Vitamin E 5 Glycerin 25 EDTA 5 Injection-gradewater Make up to 1000 ml

Preparation Method

1) 12 g of egg lecithin was completely dissolved in 100 g ofinjection-grade oil under a nitrogen atmosphere and in a 70° C. waterbath, 10 g of biphenol and 5 g of vitamin E were then added and nitrogengas was fed in for protection before being dissolved, with heat andstirring, to obtain an oil phase.

2) 25 g of glycerin and 5 g of EDTA were dissolved, with stirring, inthe injection-grade water to obtain an aqueous phase.

3) The oil phase was added slowly to the aqueous phase while shearedunder nitrogen (10000 r, 5 min) to obtain a preliminary emulsion whichwas then adjusted to around pH 8.0 with sodium hydroxide.

4) The preliminary emulsion was homogenized with a high-pressurehomogenizer for 5˜8 times at 800˜900 bar and filtered with a microporousmembrane filter before being flushed with nitrogen, sealed, autoclavedat 115° C. to obtain the final product.

Example 13 Lipid Microsphere Preparation with 1% Ascorbic Acid

Drugs and Excipients Amount (g) Biphenol 10.0 Injection-grade Soybeanoil 100 Egg lecithin 12 Ascorbic acid 10 Glycerin 25 EDTA 5Injection-grade water Make up to 1000 ml

Preparation Method

1) 12 g of egg lecithin was completely dissolved in 100 g ofinjection-grade oil under a nitrogen atmosphere and in a 70° C. waterbath. 10 g of biphenol was then added and nitrogen gas was fed in forprotection before being dissolved, with heat and stirring, to obtain anoil phase.

2) 25 g of glycerin, 5 g of EDTA and 10 g of ascorbic acid weredissolved, with stirring, in the injection-grade water to obtain anaqueous phase.

3) The oil phase was added slowly to the aqueous phase while shearedunder nitrogen (10000 r, 5 min) to obtain a preliminary emulsion whichwas then adjusted to around pH 8.0 with sodium hydroxide.

4) The preliminary emulsion was homogenized with a high-pressurehomogenizer for 5˜8 times at 800˜900 bar and filtered with a microporousmembrane filter before being flushed with nitrogen, sealed, autoclavedat 115° C. to obtain the final product.

Example 14 Lipid Microsphere Preparation with 1% Sodium Bisulfite

Drugs and Excipients Amount (g) Biphenol 10.0 Injection-grade Soybeanoil 100 Egg lecithin 12 Sodium bisulfite 10 Glycerin 25 EDTA 5Injection-grade water Make up to 1000 ml

Preparation Method

1) 12 g of egg lecithin was completely dissolved in 100 g ofinjection-grade oil under a nitrogen atmosphere and in a 70° C. waterbath. 10 g of biphenol was then added and nitrogen gas was fed in forprotection before being dissolved, with heat and stirring, to obtain anoil phase.

2) 25 g of glycerin, 5 g of EDTA and 10 g of sodium bisulfite weredissolved, with stirring, in the injection-grade water to obtain anaqueous phase.

3) The oil phase was added slowly to the aqueous phase while shearedunder nitrogen (10000 r, 5 min) to obtain a preliminary emulsion whichwas then adjusted to around pH 8.0 with sodium hydroxide.

4) The preliminary emulsion was homogenized with a high-pressurehomogenizer for 5˜8 times at 800˜900 bar and filtered with a microporousmembrane filter before being flushed with nitrogen, sealed, autoclavedat 115° C. to obtain the final product.

Part 5) Lipid Microsphere Preparation with Different Types and Amount ofAdditives Example 15 Lipid Microsphere Preparation with 1.5% Glycerinand 0.3% EDTA

Drugs and Excipients Amount (g) Biphenol 10.0 Injection-grade Soybeanoil 100 Egg lecithin 12 Vitamin E 10 Glycerin 15 EDTA 3 Injection-gradewater Make up to 1000 ml

Preparation Method

1) 12 g of egg lecithin was completely dissolved in 100 g ofinjection-grade oil under a nitrogen atmosphere and in a 70° C. waterbath. 10 g of biphenol and 10 g vitamin E were then added and nitrogengas was fed in for protection before being dissolved, with heat andstirring, to obtain an oil phase.

2) 15 g of glycerin and 3 g of EDTA were dissolved, with stirring, inthe injection-grade water to obtain an aqueous phase.

3) The oil phase was added slowly to the aqueous phase while shearedunder nitrogen (10000 r, 5 min) to obtain a preliminary emulsion whichwas then adjusted to around pH 8.0 with sodium hydroxide.

4) The preliminary emulsion was homogenized with a high-pressurehomogenizer for 5˜8 times at 800˜900 bar and filtered with a microporousmembrane filter before being flushed with nitrogen, sealed, autoclavedat 115° C. to obtain the final product.

Example 16 Lipid Microsphere Preparation with 2% Glycerin and 1% EDTA

Drugs and Excipients Amount (g) Biphenol 10.0 Injection-grade Soybeanoil 100 Egg lecithin 12 Vitamin E 10 Glycerin 20 EDTA 10 Injection-gradewater Make up to 1000 ml

Preparation Method

1) 12 g of egg lecithin was completely dissolved in 100 g ofinjection-grade oil under a nitrogen atmosphere and in a 70° C. waterbath. 10 g of biphenol and 5 g vitamin E were then added and nitrogengas was fed in for protection before being dissolved, with heat andstirring, to obtain an oil phase.

2) 20 g of glycerin and 10 g of EDTA were dissolved, with stirring, inthe injection-grade water to obtain an aqueous phase.

3) The oil phase was added slowly to the aqueous phase while shearedunder nitrogen (10000 r, 5 min) to obtain a preliminary emulsion whichwas then adjusted to around pH 8.0 with sodium hydroxide.

4) The preliminary emulsion was homogenized with a high-pressurehomogenizer for 5˜8 times at 800˜900 bar and filtered with a microporousmembrane filter before being flushed with nitrogen, sealed, autoclavedat 115° C. to obtain the final product.

Example 17 Experiment for Screening of Formulations 1) Selection ofInjection-Grade Oil

This experiment was conducted with biphenol lipid microspherepreparations prepared separately with soybean oil, medium chaintriglyceride oil, sea buckthorn oil and tea oil. The final emulsionsappeared homogenous with no layering or floating oil. 1 ml of each ofthe lipid microsphere injections was obtained separately and diluted bya factor of 1000 and their particle sizes were determined by dynamiclight scattering particle size analyzer (Marvelen, US). Results showedthat the particle sizes of the microspheres prepared using the abovementioned injection-grade oil were evenly distributed with 70% having aparticle size smaller than 500 nm and 100% having a particle sizesmaller than 1 μm which fulfilled the requirement for a lipidmicrosphere preparation to be used for intravenous injections. Soybeanoil and medium chain triglyceride oil fared the best with 90% having aparticle size smaller than 500 nm and 100% having a particle sizesmaller than 1 μm.

2) Selection of Emulsifier

This experiment was conducted with biphenol lipid microspherepreparations prepared separately with egg lecithin, soy lecithin andhydrogenated lecithin. The final emulsions appeared homogenous with nolayering or floating oil. 1 ml of each of the lipid microsphereinjections was obtained separately and diluted by a factor of 1000 andtheir particle sizes were determined by dynamic light scatteringparticle size analyzer (Marvelen, US). Results showed that the particlesizes of the microspheres prepared using the above mentionedinjection-grade oil were evenly distributed with 70% having a particlesize smaller than 500 nm and 100% having a particle size smaller than 1μm which fulfilled the requirement for a lipid microsphere preparationto be used for intravenous injections.

3) Selection of Tonicity Adjusting Agent

This experiment was conducted with glycerin as the tonicity adjustingagent so as to ensure that the microspheres would be isotonic inside thehuman body. The osmolarity of the final emulsion was determined to be300˜400 mOsm/L by an osmometer (freezing point depression method) whichfulfilled the requirement for a lipid microsphere preparation to be usedfor intravenous injection.

4) Antioxidant

This experiment was conducted with vitamin E as the antioxidant so as toprevent any instability due to oxidation. The final emulsions appearedhomogenous with no layering or floating oil. 1 ml of the lipidmicrosphere injections was obtained separately and diluted by a factorof 1000 and the particle size was determined by dynamic light scatteringparticle size analyzer (Marvelen, US). Results showed that themicrospheres obtained with the above mentioned injection-grade oil wasevenly distributed with 70% having a particle size smaller than 500 nmand 100% having a particle size smaller than 1 μm which fulfills therequirement for a lipid microsphere preparation to be used inintravenous injection.

5) Complexing Agent

This experiment was conducted with biphenol lipid microspherepreparations prepared with EDTA, a common complexing agent, so as todecrease the concentration of free positive ions in the microspheres andincrease the stability of lipid microsphere preparation. The finalemulsions appeared homogenous with no layering or floating oil. 1 ml ofeach of the lipid microsphere injections was obtained separately anddiluted by a factor of 1000 and their particle sizes were determined bydynamic light scattering particle size analyzer (Marvelen, US). Resultsshowed that the microspheres prepared using the above mentionedinjection-grade oil were evenly distributed with 70% having a particlesize smaller than 500 nm and 100% having a particle size smaller than 1μm which fulfills the requirement for a lipid microsphere preparation tobe used for intravenous injections.

The following experiments characterized the physiochemical propertiesand safeness of the lipid microsphere preparation prepared in accordanceto above description.

Experiment 1 Stability Test

The biphenol lipid microspheres prepared were kept at 4° C. for 6 monthsbefore subjected to 45° C. for 6 months and, after which, were placed atroom temperature for 12 months. The stability of the products wasevaluated in terms of their appearance, pH and encapsulation efficiency.Results are shown in Table 1.

TABLE 1 Results of the Stability Test on the biphenol lipid microspheresof this invention Encapsulation Appearance pH efficiency Sample Time 4°C. 25° C. 45° C. 4° C. 25° C. 45° C. 4° C. 25° C. 45° C. Example 0 mthHomogenous Homogenous Homogenous 7.85 7.86 7.84 98.45 98.35 98.46 1 1mth Homogenous Homogenous Homogenous 7.74 7.71 7.68 98.45 98.38 98.45 2mth Homogenous Homogenous Homogenous 7.66 7.64 7.55 98.40 98.36 98.44 3mth Homogenous Homogenous Homogenous 7.54 7.66 7.46 98.41 98.37 98.45 6mth Homogenous Homogenous Homogenous 7.32 7.52 7.29 98.38 98.25 98.36 9mth — Homogenous — — 7.48 — — 98.26 — 12 mth  — Homogenous — — 7.31 — —98.23 — Example 0 mth Homogenous Homogenous Homogenous 7.94 7.84 7.9198.54 98.38 98.44 3 1 mth Homogenous Homogenous Homogenous 7.80 7.737.82 98.39 98.44 98.54 2 mth Homogenous Homogenous Homogenous 7.74 7.667.60 98.39 98.45 98.33 3 mth Homogenous Homogenous Homogenous 7.62 7.627.47 98.64 98.38 98.31 6 mth Homogenous Homogenous Homogenous 7.39 7.537.33 98.55 98.31 98.35 9 mth — Homogenous — — 7.44 — — 98.34 — 12 mth  —Homogenous — — 7.28 — — 98.29 — Example 0 mth Homogenous HomogenousHomogenous 7.88 7.92 7.93 99.12 98.85 98.65 6 1 mth HomogenousHomogenous Homogenous 7.86 7.85 7.80 98.57 98.74 98.37 2 mth HomogenousHomogenous Homogenous 7.79 7.81 7.74 98.65 98.75 98.29 3 mth HomogenousHomogenous Homogenous 7.68 7.75 7.63 98.36 98.63 98.54 6 mth HomogenousHomogenous Homogenous 7.59 7.62 7.44 98.54 98.68 98.47 9 mth —Homogenous — — 7.46 — — 98.58 — 12 mth  — Homogenous — — 7.31 — — 98.71— Example 0 mth Homogenous Homogenous Homogenous 7.87 7.93 7.89 99.0298.99 98.66 8 1 mth Homogenous Homogenous Homogenous 7.80 7.82 7.8098.72 98.47 98.87 2 mth Homogenous Homogenous Homogenous 7.76 7.79 7.7798.56 98.65 98.25 3 mth Homogenous Homogenous Homogenous 7.65 7.73 7.6698.63 98.66 98.48 6 mth Homogenous Homogenous Homogenous 7.58 7.60 7.4898.44 98.84 98.43 9 mth — Homogenous — — 7.45 — — 98.63 — 12 mth  —Homogenous — — 7.30 — — 98.42 — Example 0 mth Homogenous HomogenousHomogenous 8.03 7.96 7.88 99.03 98.69 98.42 12 1 mth HomogenousHomogenous Homogenous 7.98 7.88 7.85 98.72 98.77 98.68 2 mth HomogenousHomogenous Homogenous 7.78 7.75 7.73 98.33 98.64 98.84 3 mth HomogenousHomogenous Homogenous 7.72 7.68 7.65 98.34 98.58 98.62 6 mth HomogenousHomogenous Homogenous 7.55 7.47 7.41 98.65 98.79 98.79 9 mth —Homogenous — — 7.42 — — 98.99 — 12 mth  — Homogenous — — 7.36 — — 98.45— Example 0 mth Homogenous Homogenous Homogenous 7.96 7.84 7.94 99.6298.64 98.41 16 1 mth Homogenous Homogenous Homogenous 7.90 7.80 7.7898.54 98.84 98.89 2 mth Homogenous Homogenous Homogenous 7.84 7.76 7.6898.80 98.62 99.03 3 mth Homogenous Homogenous Homogenous 7.75 7.71 7.6098.67 98.87 98.74 6 mth Homogenous Homogenous Homogenous 7.60 7.58 7.2498.43 98.59 98.66 9 mth — Homogenous — — 7.51 — — 98.44 — 12 mth  —Homogenous — — 7.29 — — 98.63 —

As shown in Table 1, the lipid microspheres of this invention have goodstability. No significant change to their appearance and encapsulationefficiency was noticed after being placed at 4° C. for 6 months followedby 45° C. for 6 months and, subsequently, placed at room temperature for12 months. Although there were some degrees of decrease in pH, this didnot affect the stability of the preparations.

Although the above only listed the results for the embodiments in thispart of the specification, it should be noted that other embodiments ofthis invention also possess the same or similar beneficial effects.

In conclusion, lipid microsphere preparations prepared according to thisinvention possessed good stability which met the requirements on thestability of preparations stipulated in China's National Guidelines onNovel Drug Research.

Experiment 2 Method for Quality Control

The biphenol content in this invention was determined by highperformance liquid chromatography. A C18 column (4.6 mm×200 mm, 5 μm)was used with methanol-acetonitrile-water (60:22:18) as the mobile phaseat a flow rate of 1.0 ml/min and UV detection at 275 nm. The resultsshowed that the average recovery rate was 99.35% with RSD=0.75% (n=11).Good linear relationship (r=0.9999) was found between concentration andthe area under the peak for biphenol in the range 1˜100 μg/ml.

Experiment 3 Determining the Encapsulation Efficiency of the LipidMicrosphere Preparations

Lipid microsphere preparations were centrifuged at 10000 r/min for 30minutes by ultracentrifugation. 0.5 ml of the supernatant was obtainedand dissolved with isopropyl alcohol and the biphenol content wascharacterized with high performance liquid chromatography to determinethe encapsulated biphenol content, M1. The total biphenol content inlipid microsphere preparation is M0. The following formula was used forcalculating the encapsulation efficiency which is the weight ratio ofbiphenol lipid microspheres to biphenol.

Q=M ₁ /M ₀×100%

The results showed that the encapsulation efficiency of the lipidmicrosphere preparation for intravenous injection prepared in thisinvention is greater than 98% when using biphenol as an indicator.

Experiment 4 Sterility Test

Sterility test was conducted on the lipid microsphere preparations ofthis invention in accordance to the method described in the appendix ofthe Chinese Pharmacopoeia 2010 edition. All lipid microspherepreparations of this invention passed the sterility test.

Experiment 5 Pyrogen Test

Pyrogen test was conducted on the lipid microsphere preparations of thisinvention in accordance to the method described in the appendix of theChinese Pharmacopoeia 2010 edition. All lipid microsphere preparationsof this invention passed the pyrogen test.

Experiment 6 Allergy Test

Method: Three groups of 8 guinea pigs were randomly separated based ontheir weight. Each of the guinea pigs from group 1 and group 2 was given3 successive peritoneal injections of the biphenol lipid microspherepreparations at a dose of 0.5 ml/guinea pig every other day to inducesensitization. On day 14 and day 21 after the first peritonealinjection, guinea pigs from groups 1 and 2 were given intravenousinjections of the biphenol lipid microsphere preparations at the toe ata dose of 1.0 ml/guinea pig so as to cause stimulation. For group 3, theguinea pigs were given 3 successive peritoneal injections of 20% eggwhite at a dose of 0.5 ml/guinea pig every other day to inducesensitization and, after 14 days, were given intravenous injection ofegg white at the toe at a dose of 1.0 ml/guinea pig so as to causestimulation. All three groups were observed for 15 minutes afterinjection to notice for allergic reactions.

Results: The two groups of guinea pigs injected with biphenol lipidmicrospheres which received the stimulation dose of same drug on day 14and day 21 respectively did not show any allergic response. The guineapigs in the positive control group had breathing difficulty and spasmwithin 2 minutes after injection before they died. The death of theguinea pigs were within 1˜3 minutes after injection.

Conclusion: The biphenol lipid microsphere preparation did not causeallergic reaction to guinea pigs under the current set of experimentalconditions.

Experiment 7 Hemolysis Test

Method: 0.1 ml, 0.2 ml, 0.3 ml 0.4 ml and 0.5 ml of biphenol lipidmicrosphere preparations were separately added to 5 test tubes anddiluted with 10% sucrose injection to 2.5 ml. 2.5 ml of 10% sucroseinjection was added to a sixth test tube. 2.5 ml of distilled water wasadded to a seventh test tube (Control for complete hemolysis). 2.5 ml of2% rabbit red blood cell suspension was added to each test tube andgently shaken before being placed in a 37° C. water bath. The hemolysisand coagulation in each test tube was recorded at 15 min, 30 min, 45min, 1 h, 2 h, 3 h, and 4 h.

Results: The five test tubes with biphenol lipid microspherepreparations did not cause hemolysis or coagulation in 4 hours.

Conclusion: The biphenol lipid microsphere preparation did not causehemolysis and coagulation under the current set of experimentalconditions.

Experiment 8 Irritation Test

Method: Biphenol lipid microsphere preparations were intravenouslyinjected at the left ear of 2 New Zealand white rabbits at a dose of 5ml/kg while 10% sucrose injections were intravenously injected at theright ear at a dose of 5 ml/kg. The injections were given daily for atotal of five days. The injection site was observed for any swelling orrashes since day 1. Within 24 hours after the last injection, the earswere removed and fixed in 10% formalin before being prepared forhistopathological examination.

Results: No rashes or swelling was observed on both rabbit ears thatwere injected with biphenol lipid microsphere preparation daily forconsecutive 5 days. Histopathologically, the epidermises of the rabbitears appeared normal. No inflammatory cells or blood were exudating inthe papillary layer and reticular layer. There were also no blood clotsformed in the blood vessels and other structures also appeared normal.

Conclusion: The biphenol lipid microsphere preparation had no irritationeffect on the veins of the rabbit ear.

The following animal model experiments characterized the anti-epilepticeffects of the lipid microsphere preparation prepared in accordance toabove description.

In this experiment, there were 5 groups of 20 Kunming mice each namely,model group, control group (CMC-NA-biphenol group), drug test group 1,drug test group 2 and drug test group 3.

Experiment 1 Anti-Epileptic Effect of Different Concentrations ofBiphenol Lipid Microsphere Preparations on PTZ Induced Seizures in Mice

The mode of administration, type of drug and dose administered in eachof the five groups are summarized in the following table. One hour afterthe drugs were administered, an intraperitoneal injection of PTZ (75mg/kg) was used for inducing epileptic seizure. Results are summarizedin the following table.

Mode of Dose Seizure Severity Efficacy Group Administration Type of Drug(mg/kg) 0 I II III IV V (≦III) Model Group Intravenous Non-loaded lipid100 0 0 0 0 18 2  0% (n = 20) microspheres Control Group Gavage CMCNa-100 0 0 0 2 18 0  10% (n = 20) biphenol Drug Test Intravenous Biphenollipid 100 20 0 0 0 0 0 100% Group 1 (n = 20) microspheres Drug TestIntravenous Biphenol lipid 50 20 0 0 0 0 0 100% Group 2 (n = 20)microspheres Drug Test Intravenous Biphenol lipid 20 15 3 2 0 0 0 100%Group 3 (n = 20) microspheres Seizure severity of the animal models wasevaluated based on the Racine Stages (Stage 0 No response Stage I Mouthor facial rhythmic movement Stage II Head nodding or tail flicking StageIII Clonus of a single limb Stage IV Clonus or rearing in multiple limbsStage V Full scale clonic-tonic seizure

Experiment 2 Anti-Epileptic Effect of Different Concentrations ofBiphenol Lipid Microsphere Preparations on Bicuculline Induced Seizuresin Mice

The mode of administration, type of drug and dose administered in eachof the five groups are summarized in the following table. One hour afterthe drugs were administered, a subdermal injection of Bic (2.7 mg/kg)was used for inducing epileptic seizure. Results are summarized in thefollowing table.

Mode of Dose Seizure Severity Efficacy Group Administration Type of Drug(mg/kg) 0 I II III IV V (≦III) Model Group Intravenous Non-loaded lipidEqual 0 0 0 0 0 0  0% (n = 20) microspheres Volume Control Group GavageCMCNa— 100 0 0 0 0 4 4  40% (n = 20) biphenol Drug Test IntravenousBiphenol lipid 100 20 0 0 0 0 0 100% Group 1 (n = 20) microspheres DrugTest Intravenous Biphenol lipid 50 12 1 2 3 2 0 100% Group 2 (n = 20)microspheres Drug Test Intravenous Biphenol lipid 20 10 2 3 4 1 0 100%Group 3 (n = 20) microspheres Evaluation of bicuculline based model: Thedeath rate for this model is 100%, therefore surivival after drugadministration would indicate efficacy.

Experiment 3 Anti-Epileptic Effect of Different Concentrations ofBiphenol Lipid Microsphere Preparations on 3-Mercaptopropionic AcidInduced Seizures in Mice

The mode of administration, type of drug and dose administered in eachof the five groups are summarized in the following table. One hour afterthe drugs were administered, a subdermal injection of 3-MP (60 mg/kg)was used for inducing epileptic seizure. Results are summarized in thefollowing table.

Mode of Dose Seizure Severity Efficacy Group Administration Type of Drug(mg/kg) 0 I II III (≦III) Model Group Intravenous Non-loaded lipid Equal0 0 0 20  0% (n = 20) microspheres Volume Control Group Gavage CMCNa—100 1 1 3 15 25% (n = 20) biphenol Drug Test Intravenous Biphenol lipid100 20 0 0 0 100%  Group 1 (n = 20) microspheres Drug Test IntravenousBiphenol lipid 50 20 0 0 0 100%  Group 2 (n = 20) microspheres Drug TestIntravenous Biphenol lipid 20 18 0 1 1 95% Group 3 (n = 20) microspheresEvaluation of 3-mercaptopropionic acid based model: Stage I IncubationStage II Clonic Seizure Stage III Tonic Seizure

Experiment 4 Anti-Epileptic Effect of Different Concentrations ofBiphenol Lipid Microsphere Preparations on Maximal Electroshock InducedSeizures in Mice

The mode of administration, type of drug and dose administered in eachof the five groups are summarized in the following table. One hour afterthe drugs were administered, MES was used for inducing epilepticseizure. Results are summarized in the following table.

Mode of Dose Seizure Severity Efficacy Group Administration Type of Drug(mg/kg) No Seizure Seizure (≦III) Model Group Intravenous Non-loadedlipid Equal 0 20  0% (n = 20) microspheres Volume Control Group GavageCMCNa— 100 2 18 10% (n = 20) biphenol Drug Test Intravenous Biphenollipid 100 18 2 90% Group 1 (n = 20) microspheres Drug Test IntravenousBiphenol lipid 50 15 5 75% Group 2 (n = 20) microspheres Drug TestIntravenous Biphenol lipid 20 12 8 60% Group 3 (n = 20) microspheresEvaluation of maximal electroshock based model: Assessed based onwhether the animal exhibited rigidity of all four limbs

Experiment 5 Anti-Epileptic Effect of Different Concentrations ofBiphenol Lipid Microsphere Preparations on Penicillin Induced Seizuresin Mice

The mode of administration, type of drug and dose administered in eachof the five groups are summarized in the following table. One hour afterthe drugs were administered, an intraperitoneal injection of penicillin(6 million U/kg) was used for inducing epileptic seizure. Results aresummarized in the following table.

Mode of Dose Seizure Severity Efficacy Group Administration Type of Drug(mg/kg) 0 I II III IV V (≦III) Model Group Intravenous Non-loaded lipid100 0 0 0 0 2 18  0% (n = 20) microspheres Control Group Gavage CMCNa—100 0 1 2 1 3 13  10% (n = 20) biphenol Drug Test Intravenous Biphenollipid 100 18 2 0 0 0 0 100% Group 1( n = 20) microspheres Drug TestIntravenous Biphenol lipid 50 18 1 1 0 0 0 100% Group 2 (n = 20)microspheres Drug Test Intravenous Biphenol lipid 20 15 2 0 1 1 1 100%Group 3 (n = 20) microspheres Seizure severity of the animal models wasevaluated based on the Racine Stages (Stage 0 No response Stage I Mouthor facial rhythmic movement Stage II Head nodding or tail flicking StageIII Clonus of a single limb Stage IV Clonus or rearing in multiple limbsStage V Full scale clonic-tonic seizure

Experimental results showed that the efficacy of biphenol lipidmicrosphere preparation improved several to dozens of times as comparedto CMC-NA-biphenol.

It could be observed from the above results that the preparations ofthis invention are safe and reliable and do not induce any allergic,hemolytic or irritation effects. It therefore complies with the relevantrequirements for clinically used drugs.

Although the above only selected the drug described in example 1 as thetest drug, it should be noted that other embodiments of this inventionalso possess the same or similar beneficial effects.

The allergy test, hemolytic test and irritation test on the lipidmicrosphere preparations of this invention showed that the lipidmicrosphere preparations of this invention are highly stable and do notcause any allergic, hemolytic or irritation effects. It thereforecomplies with the relevant requirements for clinically used drugs.

1-10. (canceled)
 11. A 2,2′,6,6′-tetraisopropyl-4,4′-biphenol lipidmicrosphere preparation for use in intravenous injections, wherein every100 ml of said preparation comprises 0.1 to 0.3 weight % of2,2′,6,6′-tetraisopropyl-4,4′-biphenol, 10 to 30 weight % of soybeanoil, 1 to 1.5 weight % of injection-grade egg lecithin, 0.5 to 1 weight% of vitamin E, 0.01 to 1 weight % of sodium hydroxide, 0.1 to 2.5weight % of glycerin, 0.01 to 1 weight % of EDTA, and the remainingbeing injection-grade water; and wherein the average particle size is150 nm to 300 nm.
 12. A method for preparing the2,2′,6,6′-tetraisopropyl-4,4′-biphenol lipid microsphere preparation ofclaim 1 for use in intravenous injections, comprising the steps of: 1)Dissolving appropriate amounts of injection-grade egg lecithin andvitamin E completely in injection-grade soybean oil under a nitrogenatmosphere in a 70° C. water bath before adding2,2′,6,6′-tetraisopropyl-4,4′-biphenol, with heat and stirring fordissolution, to obtain an oil phase; 2) Dissolving appropriate amountsof glycerin and EDTA in injection-grade water, with stirring, to obtainan aqueous phase; 3) Adding said oil phase slowly to said aqueous phasewhile shearing under nitrogen at 10000 r for 5 minutes to obtain apreliminary emulsion, and adjusting the pH to around 8.0 with NaOH; and4) Homogenizing said preliminary emulsion 5 to 8 times under a pressureof 800 to 900 bar before filtering with a microporous membrane filter,flushing with nitrogen, sealing and autoclaving at 115° C. to obtainsaid lipid microsphere preparation.